I am planning the installation of an outside tap in my new house.
I have been looking up the subject and the consensus of opinion is that the
tap should be installed as a tee of the pipework as close to the rising main
as possible. The rising main in the property is under the kitchen sink
which is at the front of the property.
Ideally I would like the tap to be installed off the utility room to the
side of the property rather that the front by the rising main.
Would the water pressure be significantly different in the utility room
(furthest end of kitchen from the sink) where I have a sink and the washing
machine plumbed in? The water system in the house is of the "direct" type,
i.e. there is no cold water tank in the loft.
Any help and advice would be appreciated
***** Remove ***my pants*** for email.
On Sun, 8 Feb 2004 17:06:48 -0000, "Matthew Harman" <matthew@***my
It really depends on the plumbing arrangement and the length and bore
of pipe. In fact what happens is that the flow and pressure drop as
you move further from the rising main especially if the internal
pipework is only 15mm.
Try checking the flow rate at the utility room tap (time how long it
takes to fill a bucket or other container of known size). Compare
with the kitchen tap. This will give you a rough comparison.
For the tap connection, do it with proper plumbing parts and not one
of the self tapping kits that the DIY stores sell - these drop the
flow a lot.
You will need a suitable tee piece, an isolating valve (for this
application use a lever ball valve because it is full bore and won't
restrict flow); a double check valve (this is required by law to
prevent siphoning of nasty stuff back into the mains), an appropriate
number of elbows, a wall plate and a tap to screw into it.
You can do this all using compression fittings unless you fancy having
a go at soldering the fittings. This is a good first plumbing
project. The wall plate will probably have a compression fitting
anyway. You will need some PTFE tape or some hemp and Boss White to
seal the thread where the outside tap screws into the wall plate.
To email, substitute .nospam with .gl
My outside tap (which I fitted yesterday) just needed a standard 15mm tap
connector. The check valve was internal to the tap, although I'm probably
regretting not using a standard one inside instead, as I bet it won't help
against freezing as I didn't fit a drain point to the stub of pipework
through the wall. I prefer tap connectors to standard threaded joints, as
there is no Boss White/PTFE and it is much easier to get the thing pointed
downwards when it is tightened up!
> > Hi,
> > I am planning the installation of an outside tap in my new house.
> > I have been looking up the subject and the consensus of opinion is
> > that the tap should be installed as a tee of the pipework as close to
> > the rising main as possible.
> > Would the water pressure be significantly different in the utility
> > room (furthest end of kitchen from the sink) where I have a sink and
> > the washing machine plumbed in?
> I'd be interested to know what the reason for your advice is.
> In blissfull ignorance I put mine where I dam well wanted it, and Norm
> door did the same with his 3.
> They all work ok
> mike r
Yes , mine comes out of the utility room wall, well away from the incoming
Such taps are normally used so infrequently, that where they come in the
order of things makes any
pressure differences of little consequence.
I'm not quite sure why this would matter in practice. I've got two - one
at the front of the house as close to the incoming main as near possible,
and one at the back which is the furthest thing in terms of distance. If
there's a difference in flow or pressure, I've not noticed it.
*Time is the best teacher; unfortunately it kills all its students.
Dave Plowman email@example.com London SW 12
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